CVE-2026-63839 platform/x86: lenovo-wmi-helpers: Fix memory leak in lwmi_dev_evaluate_int()
A memory leak in the Lenovo WMI helper driver allows local attackers to exhaust kernel memory, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63839?
CVE-2026-63839 is a memory corruption vulnerability in Linux, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: lenovo-wmi-helpers: Fix memory leak in lwmi_dev_evaluate_int()
lwmi_dev_evaluate_int() leaks output.pointer when retval == NULL (found by sashiko.dev [1]).
Fix it by moving `ret_obj = output.pointer' outside of the `if (retval)' block so that it is always freed by the __free cleanup callback.
No functional change intended.
Which versions are affected by CVE-2026-63839?
How do I fix CVE-2026-63839?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63839 being exploited?
There is no known exploitation of CVE-2026-63839 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63839, DEBIAN-CVE-2026-63839, GHSA-84pw-g3hf-x32j, UBUNTU-CVE-2026-63839.